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City of Pleasanton–10x Genomics Project Environmental Checklist and <br />Initial Study/Mitigated Negative Declaration Environmental Evaluation <br /> <br /> <br />FirstCarbon Solutions 103 <br />Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx <br />Environmental Issues <br />Potentially <br />Significant <br />Impact <br />Less than <br />Significant <br />Impact with <br />Mitigation <br />Incorporated <br />Less than <br />Significant <br />Impact <br />No <br />Impact <br />2.13 Noise <br />Would the project result in: <br />a) Generation of a substantial temporary or <br />permanent increase in ambient noise levels in <br />the vicinity of the project in excess of standards <br />established in the local general plan or noise <br />ordinance, or applicable standards of other <br />agencies? <br /> <br />b) Generation of excessive groundborne vibration <br />or groundborne noise levels? <br /> <br />c) For a project located within the vicinity of a <br />private airstrip or an airport land use plan or, <br />where such a plan has not been adopted, within <br />two miles of a public airport or public use <br />airport, would the project expose people <br />residing or working in the project area to <br />excessive noise levels? <br /> <br /> <br />Environmental Evaluation <br />This noise analysis has been prepared by FCS to determine the short-term construction and long- <br />term operational noise and vibration impacts associated with the proposed project. Supporting noise <br />data and calculations are provided in Appendix H of this Draft IS/MND. <br />Characteristics of Noise <br />Noise is defined as unwanted sound. Sound levels are usually measured and expressed in decibels <br />(dB), with 0 dB corresponding roughly to the threshold of hearing. Most of the sounds that we hear <br />in the environment do not consist of a single frequency, but rather a broad band of frequencies, with <br />each frequency differing in sound level. The intensities of each frequency add together to generate a <br />sound. Noise is typically generated by transportation, specific land uses, and ongoing human activity. <br />The standard unit of measurement of the loudness of sound is the decibel (dB). The 0 point on the <br />dB scale is based on the lowest sound level that the healthy, unimpaired human ear can detect. <br />Changes of less than 3 A-weighted decibel (dBA) are only perceptible in laboratory environments. A <br />change of 3 dB is the lowest change that can be perceptible to the human ear in outdoor <br />environments.86 <br /> <br />86 California Department of Transportation (Caltrans). 2013. Technical Noise Supplement to the Caltrans Traffic Noise Analysis <br />Protocol.